METHOD OF OPTIMIZATION OF THE PERIODICITY OF GASDYNAMIC WELL RESEARCH ON OIL AND GAS CONDENSATE FIELDS OF THE EXTREME NORTH Russian patent published in 2018 - IPC E21B47/06 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to the oil and gas industry and can be used to optimize the periodicity of gas dynamic studies (GDS) of wells in the oil and gas condensate fields of the Far North. Automated process control system (APCS) issues a command to the well bore telemechanics system (WBTS) for testing. Having received the command, its controlled point (CP) records the values of the bottomhole, wellhead and annular (if the sensor is installed) on the selected well, the gas temperature at the mouth and the flow rate. Value of bottomhole pressure CP is determined by calculation by the appropriate formula. Then, CP stops the operation of the selected well and controls the pressure at the wellhead and/or behind the column until it is completely stabilized by a given sampling step. Next, CP during the communication sessions, this information, generated in the form of a packet, passes through the DP to APCS, which, based on this information received from WBTS, generates a pressure recovery curve for the HPC of the well and stores it in its database (DB). After stabilizing the pressure by the command received from APCS in the WBTS, CP carries out the commissioning of the well in operation with a minimum predetermined flow rate Q and registers with a given sampling rate in time the actual production rate, wellhead and/or annulus pressure of the well. At the end of this cycle, the system switches to testing wells in reverse, from large production rates to smaller ones. Calculates the bottomhole pressure p_b wells and coefficients of filtration resistance a and b. These parameters are used by the system to process the GDS results on the basis of the equation p²_r-p²_b = aQ + bQ², describing the flow of gas to the bottom of the well, where p_r – reservoir pressure, p_b – bottom-hole pressure. When the change in the parameters a, b, and p_r after previous tests is within the tolerances of the approved field development model, this completes GDS process of the well.

EFFECT: technical result consists in increase in the efficiency of the method for optimizing gas-dynamic studies of the well, improve of environmental safety.

1 cl